CN114230520B - Bimetal composite N-amyl imidazole thiocyanate ionic liquid, preparation method thereof and application thereof in CO treatment - Google Patents
Bimetal composite N-amyl imidazole thiocyanate ionic liquid, preparation method thereof and application thereof in CO treatment Download PDFInfo
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- CN114230520B CN114230520B CN202210165331.5A CN202210165331A CN114230520B CN 114230520 B CN114230520 B CN 114230520B CN 202210165331 A CN202210165331 A CN 202210165331A CN 114230520 B CN114230520 B CN 114230520B
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- C07—ORGANIC CHEMISTRY
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- C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
- C07D233/56—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms
- C07D233/58—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring nitrogen atoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/502—Carbon monoxide
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Abstract
The invention discloses a bimetal composite N-amyl imidazole thiocyanate ionic liquid, a preparation method thereof and application thereof in CO treatment, wherein the N-amyl imidazole thiocyanate ionic liquid is mixed with cuprous thiocyanate and magnesium thiocyanate, and a homogeneous liquid obtained by heating and stirring can still keep a liquid state at room temperature; the bimetal composite N-amyl imidazole thiocyanate ionic liquid can selectively absorb CO, the equilibrium absorption amount of the bimetal composite N-amyl imidazole thiocyanate ionic liquid to CO reaches 0.229mol/mol, and the bimetal composite N-amyl imidazole thiocyanate ionic liquid has good CO circulating absorption performance, and can absorb CO and CO/N2Has good application prospect in the field of separation materials.
Description
Technical Field
The invention relates to the field of novel waste gas treatment materials, in particular to a bimetal composite N-amyl imidazole thiocyanate ionic liquid, a preparation method thereof and application thereof in CO treatment.
Background
Carbon monoxide (CO) is mainly present in industrial mixed gases such as synthesis gas, flue gas, coke oven gas and blast furnace gas, and as a highly toxic gas, CO is absorbed into the body and combined with hemoglobin to cause poisoning, but at the same time CO is also an important chemical resource and can be converted into a plurality of high value-added products such as alcohols, aldehydes, acids, esters and the like. Therefore, an efficient and energy-saving CO separation and removal technology is developed, so that the requirements of separating, purifying and purifying CO from industrial gas are met, and the method has important industrial value, environmental protection value and scientific value.
Conventional methods for separating CO include cryogenic separation, solution absorption, solid adsorption, membrane separation, etc., but these methods still have many inherent defects, such as cryogenic separation: the raw material gas is separated by condensation and fractionation in a tower by utilizing the difference of the boiling points of various gas components in the gas mixture, the purity of the separated CO is high, but the process flow is complex, the early investment and the operating cost are high, and simultaneously, the CO and the N are high2The similar boiling points and properties lead to the separation of CO and N by the method2Is difficult; solution absorption method: the method comprises a copper ammonia liquid separation method and a COSORB absorbent method which are commonly used, and the two methods have the problems of high operation energy consumption, serious pollution corrosion, easy decomposition and inactivation to unstable water vapor volume and the like; membrane separation method: although the operation is simple, the method is characterized in thatIn CO and N2The molecular diameters are close, so that the high-purity CO is difficult to separate from the molecular diameters; solid adsorption method: the selective adsorption of the adsorbent is mainly used as a basis, and the adsorption capacity of various adsorbents at present is low and the selectivity is not high, so that the efficient and high-selectivity adsorbent needs to be found.
The ionic liquid is an organic molten salt which is composed of anions and cations, is mostly in a liquid form at room temperature, has a series of unique advantages of almost no vapor pressure, no volatility, high dissolving capacity, high thermal stability, self-design and the like, is widely used as a catalyst or a medium for various reactions and separations, and has a lot of related researches in the field of acid gas absorption. At present, documents report that ionic liquids used in the field of CO absorption are mainly aprotic ionic liquids, but all of them have the problems of low absorption capacity, high ionic liquid viscosity, poor cycle stability, slow absorption rate, large temperature influence on absorption amount and the like. Since CO is a stable neutral gas containing σ -pi coordinate bonds and is liable to form pi-complexes with transition metals in the D region, it has been reported recently that a functionalized cuprous salt ionic liquid is used for absorption and separation of CO, but the absorption amount is low and the cycle performance is deteriorated. Therefore, there is a need to develop a new material with high CO adsorption capacity, good selectivity and cyclic adsorption/desorption capability to realize high-efficiency adsorption and separation of CO.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a bimetallic composite N-pentylimidazole thiocyanate ionic liquid, a preparation method thereof and application thereof in CO treatment, wherein the composite ionic liquid is prepared from the N-pentylimidazole thiocyanate ionic liquid, cuprous thiocyanate and magnesium thiocyanate, has excellent selectivity and adsorption capacity on CO, has good CO cyclic absorption performance, and can be applied to efficient absorption and separation of CO.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a first aspect of bimetallic composite N-amyl imidazole thiocyanate ionic liquid, which is prepared by the following steps: mixing N-amyl imidazole thiocyanate ionic liquid, cuprous thiocyanate and magnesium thiocyanate, heating and stirring until the system is transparent homogeneous liquid, and obtaining the bimetallic composite N-amyl imidazole thiocyanate ionic liquid.
Further, preferably, the N-amyl imidazole thiocyanate ionic liquid and cuprous thiocyanate are mixed, heated and stirred until the system is a homogeneous liquid, then magnesium thiocyanate is added, and heated and stirred until the system is a transparent homogeneous liquid.
Further, the molar ratio of the N-amyl imidazole thiocyanate ionic liquid to the cuprous thiocyanate to the magnesium thiocyanate is 1: 1-1.5: 1-1.5.
Further, the heating and stirring temperature is 343K-363K.
Further, the preparation method of the N-amyl imidazole thiocyanate ionic liquid comprises the following steps:
(1) mixing N-amyl imidazole hydrochloride and sodium thiocyanate with a solvent, stirring for 20-24 h, and performing rotary evaporation and extraction on the obtained mixed solution to obtain an ionic liquid;
(2) washing the ionic liquid with deionized water until no chloride ion exists in the solution, and carrying out rotary evaporation and drying to obtain the N-pentylimidazole thiocyanate ionic liquid.
Further, in the step (1), the solvent is acetone.
Further, in the step (1), the solvent for extraction is one or more of chloroform, dichloromethane, diethyl ether and ethyl acetate.
Further, in the step (2), AgNO is added into the washed water3If no precipitate is generated, the solution is indicated to have no chloride ions.
Further, in the step (2), the drying is specifically vacuum drying at 80 ℃ for 6 h.
The invention provides an application of the bimetallic composite N-amyl imidazole thiocyanate ionic liquid in CO adsorption and separation materials.
Further, the absorption capacity of each mole of the ionic liquid to CO is 0.108-0.229 mol at the temperature of 293.15-353.15K at 1 bar, and the absorption capacity of the ionic liquid to CO is reduced along with the increase of the temperature.
Further, after adsorbing CO, the ionic liquid is desorbed under the vacuum condition of 353.15K and less than 0.1 KPa.
Further, the separation material is used for separating CO and N2。
CO is a stable neutral gas containing sigma-pi coordinate bond and is easy to react with Cu+Form a pi-complex, and Cu+And N2、H2Light gases do not have this effect, so Cu can be used+Separation and removal of CO, but Cu from industrial mixed tail gas+Is very unstable and will be oxidized to Cu in air2+Or disproportionation reaction is carried out in water to generate copper simple substance and copper ions, so that a pi-complex can not be formed, and the cuprous salt is difficult to be directly used for adsorbing CO; the method provided by the invention is used for dissolving cuprous thiocyanate and increasing Cu content by introducing N-amyl imidazole thiocyanate ionic liquid+In combination with magnesium thiocyanate to increase Cu+Adsorption capacity for CO.
The invention has the beneficial effects that:
1. the application provides a bimetallic composite N-amyl imidazole thiocyanate ionic liquid ([ HimH][SCN]-[CuSCN]-[Mg(SCN)2]) By the active proton hydrogen in N-amyl imidazole thiocyanate and anion SCN-The absorption performance of the ionic liquid to CO can be optimized through the hydrogen bond effect between the two, and simultaneously, the existence of active proton hydrogen and magnesium thiocyanate can weaken Cu+And SCN-Under the synergistic action of active proton hydrogen and magnesium thiocyanate, Cu in cuprous thiocyanate+Increase the coordination number of (C), increase CO and Cu+Promoting the coordination of Cu (CO)2 +And Cu (CO)3 +Thereby increasing Cu in the ionic liquid+The adsorption capacity to CO is 0.229mol per mol of composite ionic liquid under normal pressure.
2. Cu in bimetallic composite N-amyl imidazole thiocyanate ionic liquid+Coordination with CO is effective in promoting CO diffusion, and Cu+And N2、H2The light gas has no effect, thus the catalyst shows excellent selectivity to CO and can be used for N2And separating from CO.
3. The bimetallic composite N-amyl imidazole thiocyanate ionic liquid has high decomposition temperature and can be used for absorbing CO at high temperature; in addition, after the composite ionic liquid absorbs CO, desorption can be carried out under the conditions of high temperature and negative pressure, and the adsorption performance of the composite ionic liquid on CO after adsorption/desorption is repeated for 5 times is unchanged, so that the composite ionic liquid has good cyclic adsorption performance.
Drawings
FIG. 1 is a graph showing the change of viscosity with temperature of ionic liquids prepared in examples 1 and 2 and comparative examples 1 to 3;
FIG. 2 is a graph of the absorption rate of CO at 303.15K and 1 bar for ionic liquids prepared in example 1, comparative example 2 and comparative example 3;
FIG. 3 is a bar graph showing the absorption capacity of the ionic liquids prepared in examples 1 and 2 and comparative examples 1 to 3 for CO at different temperatures;
FIG. 4 is a bar graph of equilibrium absorption of CO by the ionic liquid prepared in example 1 as a function of increasing number of cycles of adsorption/desorption;
FIG. 5 shows the ionic liquid prepared in example 1 under the conditions of 303.15K and 1 bar for CO and CO2、N2、H2Bar graph of the absorption amount.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
The embodiment prepares a bimetal composite N-amyl imidazole thiocyanate ionic liquid, wherein the molar ratio of N-amyl imidazole thiocyanate, cuprous thiocyanate and magnesium thiocyanate in the ionic liquid is 1: 1: 1, specifically comprising the following steps:
(1) synthesizing N-amyl imidazole thiocyanate ionic liquid:
adding N-amyl imidazole hydrochloride (17.4 g, 0.1 mol) and sodium thiocyanate (8.1 g, 0.1 mol) into a flask by using acetone as a solvent, mixing, stirring for 24 hours at room temperature, carrying out rotary evaporation, extracting and separating by using chloroform to obtain an ionic liquid, washing the obtained ionic liquid by using deionized water for a plurality of times until AgNO is added into the washed water3No precipitate was formed, and finally rotary evaporation was carried out and vacuum drying was carried out at 80 ℃ for 6 hours to obtain 16.8 g of N-pentylimidazole thiocyanate ionic liquid.
(2) Synthesizing cuprous thiocyanate/magnesium thiocyanate bimetallic composite N-amyl imidazole thiocyanate ionic liquid:
mixing N-amyl imidazole thiocyanate ionic liquid (15.8 g, 0.08 mol) with cuprous thiocyanate CuSCN (9.7 g, 0.08 mol), heating and stirring at 353K until the system becomes homogeneous liquid, and adding magnesium thiocyanate Mg (SCN) into the system2·4H2O (11.2 g, 0.08 mol), continuously heating and stirring at 353K for 8 h until the system is a transparent homogeneous liquid, cooling to room temperature until the system is still liquid, and placing in a dryer for later use.
Example 2
The embodiment prepares a bimetal composite N-amyl imidazole thiocyanate ionic liquid, wherein the molar ratio of N-amyl imidazole thiocyanate, cuprous thiocyanate and magnesium thiocyanate in the ionic liquid is 1: 1.5: 1.5, specifically comprising the following steps:
(1) synthesizing N-amyl imidazole thiocyanate ionic liquid:
adding N-amyl imidazole hydrochloride (17.4 g, 0.1 mol) and sodium thiocyanate (8.1 g, 0.1 mol) into a flask by using acetone as a solvent, mixing, stirring for 24 hours at room temperature, performing rotary evaporation, extracting and separating by using chloroform to obtain an ionic liquid, and washing the obtained ionic liquid by using deionized waterWashing for several times until AgNO is added into the water after washing3No precipitate is generated, and finally the N-amyl imidazole thiocyanate ionic liquid of 16.8 g is obtained by rotary evaporation and vacuum drying at 80 ℃ for 6 h.
(2) Synthesizing cuprous thiocyanate/magnesium thiocyanate bimetallic composite N-amyl imidazole thiocyanate ionic liquid:
mixing N-amyl imidazole thiocyanate ionic liquid (15.8 g, 0.08 mol) with cuprous thiocyanate CuSCN (14.6 g, 0.12 mol), heating and stirring at 353K until the system becomes homogeneous liquid, and adding magnesium thiocyanate Mg (SCN) into the system2•4H2O (16.8 g, 0.12 mol), continuing to heat and stir at 353K for 8 h until the system is a transparent homogeneous liquid, cooling to room temperature until the system is still liquid, and placing the liquid in a dryer for later use.
Comparative example 1
The comparative example prepares a bimetallic composite N-pentylimidazole thiocyanate ionic liquid, wherein the molar ratio of N-pentylimidazole thiocyanate, cuprous thiocyanate and magnesium thiocyanate in the ionic liquid is 1: 0.8: 0.8, specifically comprising the following steps:
(1) synthesizing N-amyl imidazole thiocyanate ionic liquid:
adding N-amyl imidazole hydrochloride (17.4 g, 0.1 mol) and sodium thiocyanate (8.1 g, 0.1 mol) into a flask by using acetone as a solvent, mixing, stirring for 24 hours at room temperature, carrying out rotary evaporation, extracting and separating by using chloroform to obtain an ionic liquid, washing the obtained ionic liquid by using deionized water for a plurality of times until AgNO is added into the washed water3No precipitate is generated, and finally the N-amyl imidazole thiocyanate ionic liquid of 16.8 g is obtained by rotary evaporation and vacuum drying at 80 ℃ for 6 h.
(2) Synthesizing cuprous thiocyanate/magnesium thiocyanate bimetallic composite N-amyl imidazole thiocyanate ionic liquid:
mixing N-amyl imidazole thiocyanate ionic liquid (15.8 g, 0.08 mol) with cuprous thiocyanate CuSCN (7.8 g, 0.064 mol), heating and stirring at 353K until the system becomes homogeneous liquid, and adding magnesium thiocyanate Mg (SCN) into the system2•4H2O (9.0 g, 0.064 mol) at 353KAnd continuously heating and stirring for 8 hours until the system is transparent homogeneous liquid, cooling to room temperature until the system is still liquid, and placing the system in a dryer for later use.
Comparative example 2: synthesis of N-pentylimidazole thiocyanate (abbreviated as [ HimH ] [ SCN ]) ionic liquid
The synthesis of N-pentylimidazole thiocyanate ionic liquid in this comparative example was the same as in the above example and comparative example 1.
Comparative example 3: synthesis of cuprous thiocyanate composite N-amylimidazole thiocyanate (short for [ HimH ] [ SCN ] - [ CuSCN ]) ionic liquid
The preparation method of the cuprous thiocyanate composite N-pentylimidazole thiocyanate ionic liquid comprises the following steps:
(1) synthesizing N-amyl imidazole thiocyanate ionic liquid:
adding N-amyl imidazole hydrochloride (17.4 g, 0.1 mol) and sodium thiocyanate (8.1 g, 0.1 mol) into a flask by using acetone as a solvent, mixing, stirring for 24 hours at room temperature, carrying out rotary evaporation, extracting and separating by using chloroform to obtain an ionic liquid, washing the obtained ionic liquid by using deionized water for a plurality of times until AgNO is added into the washed water3No precipitate is generated, and finally the N-amyl imidazole thiocyanate ionic liquid of 16.8 g is obtained by rotary evaporation and vacuum drying at 80 ℃ for 6 h.
(2) Synthesizing cuprous thiocyanate composite N-amyl imidazole thiocyanate ionic liquid:
mixing N-amyl imidazole thiocyanate ionic liquid (15.8 g, 0.08 mol) with cuprous thiocyanate CuSCN (9.7 g, 0.08 mol), heating and stirring at 353K for 8 h until the system is a transparent homogeneous liquid, cooling to room temperature, keeping the system in a liquid state, and placing in a dryer for later use.
Study of Properties
(1) Analysis of thermal stability
The ionic liquids prepared in example 1, comparative example 2 and comparative example 3 were subjected to thermal analysis tests, and the test results show that the ionic liquids prepared in example 1, comparative example 2 and comparative example 3 have decomposition temperatures of 282.9 ℃, 200.3 ℃ and 279.3 ℃, respectively, and the higher the decomposition temperature is, the better the thermal stability of the ionic liquid at high temperature is, so that it can be known that the introduction of cuprous thiocyanate and magnesium thiocyanate into the N-pentylimidazole thiocyanate ionic liquid can improve the thermal stability of the ionic liquid and is beneficial to the application of the ionic liquid in a high-temperature environment.
(2) Viscosity analysis
The ionic liquids prepared in the above examples 1 and 2 and comparative examples 1 to 3 were subjected to viscosity analysis, and the viscosity of different ionic liquids was investigated for the change with the temperature increase within the interval of 298.15K to 333.15K, and the test results are shown in FIG. 1. from the viscosity analysis results, it can be seen that the viscosity of all samples decreased with the temperature increase, and compared with the ionic liquids prepared in comparative examples 2 and 3, [ HimH ] prepared in examples 1 and 2 and comparative example 1 at low temperature][SCN]-[CuSCN]-[Mg(SCN)2]The ionic liquid has lower viscosity, and the low viscosity is beneficial to reducing gas-liquid mass transfer resistance and increasing the absorption capacity of the ionic liquid to gas.
(3) Analysis of CO absorption Capacity for different Ionic liquids
The ionic liquids prepared in example 1, comparative example 2 and comparative example 3 were used to absorb CO, and the absorption rates of CO at 303.15K and 1 bar were measured for different ionic liquids, and as shown in FIG. 2, the equilibrium absorption amounts of CO were 0.194 mol, 0.074 mol and 0.128 mol per mol of the ionic liquids prepared in example 1, comparative example 2 and comparative example 3, respectively, whereby it was found that [ HimH ] prepared in comparative example 2 was similar to that of [ HimH ]][SCN]Comparing the ionic liquid, adding cuprous thiocyanate to prepare [ HimH ] in the comparative example 3][SCN]-[CuSCN]The equilibrium absorption amount of the ionic liquid to CO is greatly improved, which shows that CO can be mixed with Cu+The coordination effect is generated, and the absorption of the ionic liquid to CO is improved; [ HimH ] from example 1 was prepared by introducing magnesium thiocyanate into the ionic liquid described in comparative example 3][SCN]-[CuSCN]-[Mg(SCN)2]The balance absorption capacity of the bimetal composite ionic liquid to CO is further greatly improved, and the phenomenon shows that the introduction of magnesium thiocyanate is beneficial to improving the absorption capacity of the ionic liquid to CO.
(4) Effect of temperature on CO absorption by Ionic liquids
The above examples 1 and 2 and comparative example 1 were mixed-3, taking 5 parts of each prepared ionic liquid, and respectively placing the ionic liquids at 293.15K, 303.15K, 313.15K, 333.15K and 353.15K under the condition of normal pressure and 1 bar to absorb CO (controlling the initial concentration of CO in the container to be the same), so that the absorption capacities of different ionic liquids to CO are reduced along with the increase of the temperature as shown in FIG. 3; under the same temperature condition, the absorption capacities of different ionic liquids to CO are from high to low in sequence as example 1>Example 2>Comparative example 1>Comparative example 3>Comparative example 2, when the temperature was reduced to 293.15K, [ HimH ] per mole prepared in example 1][SCN]-[CuSCN]-[Mg(SCN)2]The absorption of CO by the ionic liquid reached 0.229mol per mol of [ HimH ] prepared in example 1 when the temperature was raised to 353.15K][SCN]-[CuSCN]-[Mg(SCN)2]The absorption capacity of the ionic liquid to CO can still reach 0.108 mol.
(5) [HimH][SCN]-[CuSCN]-[Mg(SCN)2]Cyclic adsorption performance of ionic liquid on CO
[ HimH ] prepared in example 1][SCN]-[CuSCN]-[Mg(SCN)2]Absorbing CO gas by the ionic liquid under the conditions of 303.15K and 1 bar, desorbing the ionic liquid under the conditions of 353.15K and a vacuum degree lower than 0.1KPa after adsorption saturation, continuously repeating the adsorption/desorption test for 5 times on the same sample, wherein the test result is shown in figure 4, and after 4 adsorption/desorption cycle tests, the equilibrium absorption capacity of the composite ionic liquid to CO is almost not lost, so that the Cu is known to be almost+The complexing absorption with CO is a reversible process, and the [ HimH ] after CO absorption can be heated due to the fact that the bonding energy of the complexing is far less than the common covalent bonding energy][SCN]-[CuSCN]-[Mg(SCN)2]The ionic liquid is recycled, and the recycled ionic liquid has no obvious change on the CO adsorption performance, which also shows that the composite ionic liquid has excellent CO cyclic adsorption performance.
(6) [HimH][SCN]-[CuSCN]-[Mg(SCN)2]Selective absorption of CO by ionic liquids
[ HimH ] prepared in example 1][SCN]-[CuSCN]-[Mg(SCN)2]The ionic liquid can be used for treating different gases (CO and CO) under the conditions of 303.15K and 1 bar2、N2、H2) The equilibrium absorption amounts of the different gases by the adsorption treatment are shown in FIG. 5, from which it is understood that [ HimH][SCN]-[CuSCN]-[Mg(SCN)2]The ionic liquid has the highest equilibrium absorption amount on CO and lower equilibrium absorption amount on other three gases, particularly on N2Has an extremely low equilibrium absorption of CO with N2Is about 22: 1, which also indicates that the ionic liquid is used for treating CO and N2Has high selectivity to CO, so that the [ HimH ] prepared by the method is][SCN]-[CuSCN]-[Mg(SCN)2]Ionic liquid in N2And the field of CO separation has good application prospect.
The unit mol/mol of the ordinate of FIGS. 2 to 5 means: the amount of absorption of the corresponding gas per mole of ionic liquid.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. The bimetallic composite N-pentylimidazole thiocyanate ionic liquid is characterized in that the N-pentylimidazole thiocyanate ionic liquid and cuprous thiocyanate are mixed, heated and stirred until a system is a homogeneous liquid, then magnesium thiocyanate is added, and heated and stirred until the system is a transparent homogeneous liquid, so that the bimetallic composite N-pentylimidazole thiocyanate ionic liquid is obtained.
2. The bimetallic composite N-pentyl imidazole thiocyanate ionic liquid as claimed in claim 1, wherein the molar ratio of N-pentyl imidazole thiocyanate ionic liquid to cuprous thiocyanate to magnesium thiocyanate is 1: 1-1.5: 1-1.5.
3. The bimetallic composite N-pentyl imidazole thiocyanate ionic liquid as claimed in claim 1, wherein the temperature of heating and stirring is 343K-363K.
4. The bimetallic composite N-pentyl imidazole thiocyanate ionic liquid as claimed in claim 1, wherein the preparation method of the N-pentyl imidazole thiocyanate ionic liquid comprises the following steps:
(1) mixing N-amyl imidazole hydrochloride and sodium thiocyanate with a solvent, stirring for 20-24 h, and performing rotary evaporation and extraction on the obtained mixed solution to obtain an ionic liquid;
(2) washing the ionic liquid with deionized water until no chloride ion exists in the solution, and carrying out rotary evaporation and drying to obtain the N-pentylimidazole thiocyanate ionic liquid.
5. The bimetallic composite N-pentylimidazole thiocyanate ionic liquid as claimed in claim 4, wherein in step (1), the solvent for extraction is one or more of chloroform, dichloromethane, diethyl ether and ethyl acetate.
6. The application of the bimetallic composite N-amyl imidazole thiocyanate ionic liquid as described in any one of claims 1-5 in the aspects of CO adsorption and separation materials.
7. The use according to claim 6, wherein the absorption capacity of the ionic liquid for CO is 0.108-0.229 mol per mol at a temperature of 293.15-353.15K and at 1 bar; and desorbing the ionic liquid at 353.15K and under the vacuum degree lower than 0.1KPa after adsorbing CO.
8. Use according to claim 6, of said separation material for separating CO from N2。
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